Viking ring fort and settlement, the Shetland Islands, Jarlshof, Scotland. It has been described as "one of the most remarkable archaeological sites ever excavated in the British Isles". It contains remains dating from 2500 BC up to the 17th century AD.
The Olmec colossal heads are at least seventeen monumental stone representations of human heads sculpted from large basalt boulders. The heads date from at least before 900 BC and are a distinctive feature of the Olmec civilization of ancient Mesoamerica. All portray mature men with fleshy cheeks, flat noses, and slightly crossed eyes; their physical characteristics correspond to a type that is still common among the inhabitants of Tabasco and Veracruz.
The sacred site of Chichen-Itza in Mexico was one of the greatest Mayan centres of the Yucatán peninsula. In it's 1000 year history, it's been handed around a bit. As a result it shows off Mayan construction techniques with new elements from central Mexico. If you've made the climb to the top. Good on you, you very fit person.